Patent US3402487A successfully refreshed from Google Patents.
US3402487A
Expired / Lapsed
US
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Hydropneumatic river rake
Assignee: Bayer Corp
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Filing: 1964-09-11
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Granted: 1968-09-24
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Expires: 1984-09-11
Abstract
No abstract record available.
Inventors
- 👤 Allan H Vaughan
- 👤 Gordon E Christman
- 👤 Leon W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:50
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/28; E02F5/287; E02F3/00; E02F3/04; E02F3/88; E02F3/90; E02F3/92; E02F3/9212; E02F3/9218
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |